krogstad



Paiented Sept, 27, 1829s. 0. L. KROGSTAD. V OSCILLATING PISTDN'STEAM ENGINE.

(Application filed Oct. 20, 1897.)

(No Model.)

Sheets-Sheet I.

ls Parana no PHOTO LKTHO Patented Sept. 27, I898.

l N0. 6ll,493.

0. L. KRUGSTAD. OSCILLATING PISTON STEAM ENGINE.

(Application filed. Oct. 20, 1897.) (No Model.) 3 $heetsSheet 2.

34 1X 24 27 2 5Q 2/ @y 0Z3 7 WOcW' N I Patented Sept. 27, I898.

4 o. L. KROGSTAD. OSCILLATING PISTON STEAM ENGINE.

(Application filed Oct. 20, 1897.)

3 Shan -Sheet 3.

IIIIIIIIIII L 32 .34 g am..." 2

' aw/income;

@Hommm s STATES i'rn OLE L. KROGSTAD, OF HUDSON, WISCONSIN, ASSIGNOR OF ONE-HALF TO ANTON HOVLAND,

OF SAME PLACE.

SPECIFICATION forming-part of Letters Patent No. 611,493, dated September 27, 1898.

Application filed October 20, 1897. Serial No. 655,821. (No model.)

' To all whom it may concern:

Beit known that I, OLE L. KROGSTAD, a citizen of the United States,and a resident of Hudson, in the county of St. Croix and State of Wisconsin, have invented certain new and useful Improvements in Oscillating-Piston Steam-Engines; and I do hereby declare that the following is afull, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

My invention relates to oscillating-piston steam engines of that class or description comprising a cylinder, two oppositely-oscillating pistons located therein and connected with separate shafts, a driving-shaft provided with diametrically opposite cranks, connect ing-rods or pitmen connecting said cranks with corresponding cranks on the pistonshafts, and an oscillating steam-valve for alternately admitting steam to opposite sides of the piston and eccentric, provided with a crank connected with an eccentric on the drivingshaft for operating the valve.

The object of the invention is to provide an improved construction of such engine, whereby I secure important advantages with respect to efliciency in operation.

The invention consists in the novel construction and combination of parts, as hereinafter fully described and claimed.

In the accompanying drawings, Figure 1 is a plan view of an oscillating-piston steam-engine constructed in accordance with my invention. Fig. 2 is a sectional view on the line a c, Fig. 1. Fig. 3 is a horizontal section on the line b b, Fig. 2. Fig. 4: is a sectional view on the line a c, Fig. 1. Fig. 5 is an inner face view of the valve-chest, the valve being removed to show the spring-seats for the same, which also are formed with steam-passages. Figs. 6 and 7 are detail views of the said spring-seats. Fig. Sis an end view of the cylinder-head provided with the steam-ports and showing the oscillating valve in dotted lines. Fig. 9 is a perspective view of the oscillating valve.

In the said drawings the reference-numeral 1 designates the base of the engine, provided at one end with two standards 2, in which is journaled the driving-shaft 3, provided with a pulleyt and fly-wheel 5 and with an eccen trio 6, having yoke or strap 7, connected by rod 8 with the crank of an oscillating valve hereinafter described. Fixed to each end of said shaft is a crank-wheel 9 and 10, provided with a wrist-pin 11, diametrically opposite each other or located at opposite sides of the axial line of the shaft. These wrist-pins are connected with piston-shafts hereinafter described.-

The numeral 12 designates a steam-cylininder comprising the rim 13, having at equal distances apart a number of semicircular lugs 14, with apertures or holes therein.

The numeral 15 designates the cylinderheads, connected with the cylinder by means of bolts 16, passing through said lugs. Passing through said cylinder-heads are hubs 17 and 18, provided with tubular extensions 19 and 20, which arejournaled on asliaft 21, which in turn passes through bosses 2 2 on the upper' ends of standards 23, secured to the bed 1. Secured to the inner end of each of said hubs is a piston 24:, consisting of a metal segment of a thickness equal to the distance between the cylinder-heads, and each projects beyond the end of the hub, so that when in place the projecting portion of one will overlap the hub of the other. Formed in the sides and end of these pistons or segments are slots 25, in which are fitted two L-shaped packingstrips 26, having their meeting ends cut away so as to overlap each other. Coiled springs 27 serve to press their packing-strips against the interior of the cylinder and make a tight joint.

Formed in one of the cylinder-heads are two opposite steam-passages 28, which are alternately opened and-closed by means of an oscillating valve 29, secured to ahub 30, j ournaled on the extension 20 of the hub 18, and

is located in a valve-chest 32, consisting of a circular plate 33, formed with an inwardlyprojecting annular flange 34., connected with the cylinder by the same bolts which secure the heads thereto. Thisvalve consists of two wings, each providedwith a port 30. These ports are not in diametric alinement, but are inclined at an angle to each other. The lower side of each of these wings is formed with a ledge 29 and with a cut-away or beveled portion 29 (see Fig. 9) for a purpose hereinafter described. The said valve-chest on its outer side is formed with a segmental recess 36, closed by a cap-plate 37, bolted to the valve-chest and forming a steam chamber or chest with which the steam-supply pipe 38 communicates. At each end of this steamchamber is a circular steam-passage 39, extending through the plate 33, formed on the inner side with an annular groove 40. Seated in said passage is an annulus or ring 41, provided with a stem 42, connected with the ring by ribs or webs 4:3. This stem is stepped in a lug 45, formed on the inner side of plate 37, and a coiled spring 46 encircles said stem. The said ring is formed with an upwardly-extending flange 47, between which and the side of groove 40 is inserted aring 48. The object of said rings 41 and 4:8 is to form a tight joint between them and the valve, the spring 46 pressing them against the valve.

Secured to the hub of the valve 29 is a crank 49, which is connected by the rod 49 with the eccentric 6, by which the valve is oscillated.

Secured to the extensions 19 and 20 of the hubs 17 and 18 are cranks 50, which are connected by pit-men 51 with the wrist-pins 11 of the crank-wheels 9 and 10.

The numeral 52 designates collars on the extensions 19 and 20 of the hubs 17 and 18, and located on one side of the cylinder and between the valve-crank and the adjoining piston-crank is a collar 52.

The numeral 53 designates washers bearing against the piston-cranks and against coiled springs 54:, located in recesses 56 in the bosses 22 of the standards 23.

The numeral 57 designates the exhaustport.

The shaft 21 is hollow and is provided with holes 58 for the passage of oil or lubricating material, and the hub 20 is also provided with holes or apertures for the same purpose.

The operation is as follows: When the oscillating valve is turned so as to bring one of the ports 30 therein into coincidence with one of the steam-passages 39 and with the corresponding port 28 in the cylinder-head, the other port 30 will be moved out of coincidence with the other steam-passage 39, which will be closed by the lower portion of the wing of the valve containing this port. The cut-away portion or ledge of said wing will now be in coincidence with the port in the cylinder-head. Steam being supplied to the valve-chest from the supply-pipe will escape through said first-named ports and passages to the cylinder between the two pistons, forcing them away from each other and turning the hubs and extensions connected therewith in opposite directions. The wrist-pins 11 on the crank-wheels of the driving-shaft being diametrically opposite to each other will ropassing through the passage which was before closed, through the ports in the valve and cylinder-head, and reversing the movement of the cylinders. The port in the opposite wing of the valve will now come over the ledge and beveled portion of said wing, so that the exhaust-steam will pass through said port into the exhaust chamber, and thence out through the exhaust-opening 57.

In an engine constructed as above the steam will act directly on the pistons and the pitmen connected therewith, alternately pulling and pushing on the crank-wheels of the driving-shaft, so that there will be but little loss of power.

' Having thus fully described my invention, what I claim is 1. In an oscillating-piston steam-engine, the combination with the cylinder, the cylinder-heads, one of which is formed with opposite steam-ports, the oscillating pistons, the hubs thereof, and connections with the driving-shaft, of the valve-chest secured to said cylinder, formed with an exhaust-opening in the lower part and with opposite steam-passages, the oscillating valve located in said chest, comprising the wings formed with steam -ports extending therethrough, and their lower sides cut away or beveled, and means for oscillating said valve, substantially as described.

2. In an oscillating-piston steam-engine, the combination with the cylinder-heads, one of which is provided with opposite steamports, the oscillating pistons located in said cylinder, the hubs and tubular extensions connected therewith, the driving-shaft and means connected therewith and with said pistons, for rotating said shaft, of the valvechest having a segmental steam chamber therein, with a steam-passage at each end, coinciding or registering with the ports in said head, and with an exhaust-opening at the lower end, the oscillating valve located in said chest, comprising two opposite integral wings formed with ports, and the lower sides of said wings cut away to form a ledge or beveled portion, the crank connected with said Valve, the connecting-rod'and the eccentric on said driving-shaft, substantially as described.

3. In an oscillating-piston steam-engine, the combination with the cylinder, the cylinder-heads, one of which is formed with opposite steam-ports, the oscillating pistons located in said cylinder, the hubs formed there with, the driving-shaft and means connected therewith and with said pistons for rotating said shaft, of the valve-chest having a seghubs thereof, the driving-shaft, and means connected therewith and with the pistons, for rotating the said shaft, of the valve-chest secured to said cylinder formed with an exhaust-opening in the lower part, and with opposite steam-passages provided with circular grooves in the inner sides, the ring provided with a flange, the stem, the coiled spring, the ring seated in said groove, the oscillating valve located in said chest, comprising the opposite wings having steamports passing therethrough, and said wings cut away or beveled at the lower sides, and

the oscillating valve having opposite ports,

the crank, the connecting-rod and the eccentric, of the pistons located in said cylinder,

the hubs and extensions, the cranks secured to said extensions, the cranks, the pitmen, the crank-wheels and the wrist-pins, substantially as described.

6. In an oscillating-piston steam-engine, the combination with the cylinder, the oscillating overlapping pistons, the hubs and extensions, the shaft upon which they are j ournaled, the standards provided with bosses having recesses in the inner sides, the coiled springs seated in said recesses,the washers interposed between said extensions and springs, the piston-cranks secured to said extensions, the collars, and the washers on said shaft, substantially as described.

7. In an oscillating-piston steam-engine, the combination with the cylinder, the oscillating pistons, the hubs and extensions, the hollow shaft upon which they are journaled formed with holes or apertures, the standards provided with bosses having recesses in the inner sides,the coiled springs located therein, the piston-cranks secured to said extensions, the driving-shaft provided with oppositelydisposed cranks, and the pitmen connected therewith, substantially as described.

8. In an oscillating-piston steam-engine, the combination with the cylinder, the cylinder-heads, one of which is provided with opposite ports, the segmental overlapping pistons located in said cylinder, formed with grooves in the ends and sides, the L-shaped packingstrips located in said grooves,with their'meeting ends cut away and overlapping each other, the hubs and extensions formed integral with said pistons, the standards provided with bosses, having recesses in the inner faces, the coiled springs seated therein, and the cranks secured to said extensions, of the valve-chest secured to said cylinder provided with opposite steam-passages, in register or coincidence with the ports in the cylinder-head, the oscillating valve located in said chest, provided with steam-ports extending therethrough and cut away or beveled at the lower side, and means connected therewith for oscillating said valve, substantially as described.

In testimony that I claim the foregoing as my own I have hereunto affixed my signature in presence of two witnesses.

OLE L. KROGSTAD.

Witnesses:

ANDREW JOHNSON, Orro W. ARNQUIST. 

